3BHB003688R0101 ABB Variable frequency circuit board

Description

Technical Requirements 3BHB003688R0101：

I. Chips with programs
wifi microscope for circuit board detection
wifi microscope for circuit board detection
1.EPROM chip should not be damaged generally. Because the chip requires UV light to erase the program, it will not damage the program during testing. But there is information: because of the material of making the chip, with the passage of time (years), even if not used, it may be damaged (mainly refers to the program). So back it up as much as possible.
2.EEPROM,SPROM, and RAM chips with batteries are easy to destroy the program. Whether such chips break programs after scanning VI curves using < Tester > has not been determined. Nonetheless, colleagues should be careful in such situations. The author has done many tests, the possible reason is: maintenance tools (such as tester, soldering iron, etc.) caused by the shell leakage.
3. For the chip with battery on the circuit board, do not remove it from the board.
Ii. Reset circuit
1. If there is a large-scale integrated circuit on the circuit board to be repaired, pay attention to the reset problem.
2. Before the test, it is best to put it back on the equipment, and repeatedly turn on and off the machine to try. And press the reset button more than once.
Iii. Function and parameter testing
Portable microscope for circuit board inspection
Portable microscope for circuit board inspection
1. The detection of the device by < tester > can only reflect the cut-off area, amplification area and saturation area. However, it is impossible to measure specific values such as operating frequency and speed.
2. Similarly, for TTL digital chips, only output changes of high and low levels can be known. There is no way to find out the speed of its rising and falling edges.
Four. Crystal oscillator
1. Usually only oscilloscope (crystal oscillator needs to be powered up) or frequency meter test, multimeter can not be measured, otherwise can only use the substitution method.
2. The common faults of crystal vibration are :a. Internal leakage,b. Internal open circuit and c. Metamorphic frequency deviation d. Peripheral connected electric leakage. Here leakage phenomenon, with < tester > VI curve should be measured.
3. During the whole board test, two judgment methods can be adopted :a. During the test, the relevant chips near and around the crystal oscillator do not pass. No other fault points were found except for the crystal oscillator.
Portable microscope inspection circuit board
Portable microscope inspection circuit board
4. There are two common crystal vibration types :a. two-pin and b. four-pin, the second pin is power supply, pay attention not to short circuit at will. V. Distribution of fault phenomena 1. Incomplete statistics of circuit board fault location :1) chip damage 30%, 2) discrete component damage 30%,
3) 30% of the wiring (PCB copper wire) is broken; 4) 10% of the program is broken or lost (with a rising trend).
2. According to the above, when the circuit board to be repaired appears the wiring and program problems, and there is no good board, neither familiar with its wiring, can not find the original program. It is unlikely that the board will be repaired.

This article is from the official website of Zhangzhou Branch of Xiamen Xiongba E-commerce Co., LTD. Please attach this link: http://www.sauldcs.com/

3BHB003688R0101

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